When a subquery includes a `QuerySet`, it's impossible to match, because even though the surrounding `Q` object attempts to check equality, `QuerySet` equality is strictly based on identity. This change adds a check to see if the value in the Q object is a QuerySet, and replace it with a subquery placeholder. This changes the processed `WHERE` clause from `Q(group__in=<QuerySet []>)` to `Q(group__in=('__QuerySet__subquery__', 1))`, which can be included in the expected result. Testing Done: - Ran unit tests. - Used in Review Board tests that (under Django 5.2) are including a `QuerySet` in the `WHERE` clause.